ssl-opt.sh: Fix some test case descriptions

Fix copypasta in some test cases with
MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES enabled.

Add unique suffix to the two
"DTLS fragmenting: proxy MTU: auto-reduction" test cases.
diff --git a/tests/ssl-opt.sh b/tests/ssl-opt.sh
index 625fa34..5ea0a67 100755
--- a/tests/ssl-opt.sh
+++ b/tests/ssl-opt.sh
@@ -1162,7 +1162,7 @@
             -c "The certificate is signed with an unacceptable hash"
 
 requires_config_enabled MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES
-run_test    "SHA-1 forbidden by default in server certificate" \
+run_test    "SHA-1 allowed by default in server certificate" \
             "$P_SRV key_file=data_files/server2.key crt_file=data_files/server2.crt" \
             "$P_CLI debug_level=2 allow_sha1=0" \
             0
@@ -1185,7 +1185,7 @@
             -s "The certificate is signed with an unacceptable hash"
 
 requires_config_enabled MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES
-run_test    "SHA-1 forbidden by default in client certificate" \
+run_test    "SHA-1 allowed by default in client certificate" \
             "$P_SRV auth_mode=required allow_sha1=0" \
             "$P_CLI key_file=data_files/cli-rsa.key crt_file=data_files/cli-rsa-sha1.crt" \
             0
@@ -7629,7 +7629,7 @@
 requires_config_enabled MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA
 requires_config_enabled MBEDTLS_AES_C
 requires_config_enabled MBEDTLS_GCM_C
-run_test    "DTLS fragmenting: proxy MTU: auto-reduction" \
+run_test    "DTLS fragmenting: proxy MTU: auto-reduction (not valgrind)" \
             -p "$P_PXY mtu=508" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \
@@ -7653,7 +7653,7 @@
 requires_config_enabled MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA
 requires_config_enabled MBEDTLS_AES_C
 requires_config_enabled MBEDTLS_GCM_C
-run_test    "DTLS fragmenting: proxy MTU: auto-reduction" \
+run_test    "DTLS fragmenting: proxy MTU: auto-reduction (with valgrind)" \
             -p "$P_PXY mtu=508" \
             "$P_SRV dtls=1 debug_level=2 auth_mode=required \
              crt_file=data_files/server7_int-ca.crt \